A black man who was incapacitated with a stun gun is suing the white Arkansas police officer who arrested him.

Chardrick Mitchell on Wednesday filed the civil suit in Mississippi County against Blytheville Officer Stephen Sigman, Police Chief Ross Thompson and the city of Blytheville.

The lawsuit says police video shows Mitchell was walking away from Sigman on July 4 when the officer fired his stun gun at roughly the same time he announced Mitchell was under arrest. It alleges there's an "institutionalized practice of using excessive force against African-Americans."

Mitchell has been charged with obstruction of government operations, disorderly conduct and failure to submit to arrest.

Blytheville police Capt. Jeremy Ward says Sigman is still employed, but has declined to comment on the officer's status or the lawsuit.